沥青防水卷材根据涂盖______材料的不同分为氧化沥青防水卷材和高聚物改性沥青防水卷材两大类。
A. 高聚物
B. 沥青
C. 聚合物
D. 沥青基
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用链表表示线性表的优点是______。
A. 便于随机存取
B. 花费的存储空间较顺序存储少
C. 便于捅入和删除操作
D. 数据元素的物理顺序与逻辑顺序相同
The author thinks the negotiations will fail at last mainly because______.
A. Iran is trying to develop its domestic economy through its energy program
B. there are absolutely no sincerities between Iran and European countries during the negotiation
C. European countries cannot bring security benefits as Iran's nuclear program does
D. the negotiators decide to take some economic or political sanctions toward Iran
He has______ strange hobbies like collecting bottle tops and inventing secret codes.
A. gone on
B. gone in for
C. gone with
D. gone through with
In my opinion, a friendship may be______ , casual, situational or deep and lasting.
A. identical
B. original
C. superficial
D. critical
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